You start out the year planning to keep a notebook in your car to write down all of your mileage when you visit clients or have to head to that important meeting. By February, you’ve been too busy to keep up with it. While the tax code allows for business related driving to be tax deductible, the key is to have accurate documentation. Record the date, the amount of miles traveled; the tolls you paid, the parking costs you paid as well as the reason for the trip.

To use the most straightforward method, do this. First, add up all of the mileage, and then add in the costs involved just as tolls and calculate the cost. Your mileage is calculated based on a set amount per mile.

There are other methods to calculation that your tax professional can help with. Leases, purchasing a new car and even having your business out of your home, all offer deduction potential.